CN115085285B - Multi-zone flexible direct current interconnection self-adaptive power coordination control method - Google Patents
Multi-zone flexible direct current interconnection self-adaptive power coordination control method Download PDFInfo
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- 238000009827 uniform distribution Methods 0.000 claims abstract description 5
- 230000003044 adaptive effect Effects 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 abstract 1
- 238000011217 control strategy Methods 0.000 description 4
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a flexible direct current interconnection self-adaptive power coordination control method for a plurality of areas, which relates to the technical field of power transmission and distribution and comprises the following steps: when the system is in AC side load P Li When the power transmission value P of each district VSC converter at rated voltage is automatically adjusted when the power transmission value P is changed cni According to rated capacity S of transformer in each area Ni The size of the system realizes the uniform distribution of the system alternating current load; when the system DC side total power P Z When in change, each district VSC converter monitors the DC voltage U dc Change condition and power distribution coefficient K i According to rated capacity S of transformer in each zone Ni The power variation of the direct current side is uniformly distributed; the invention realizes the mutual energy balance of a plurality of areas, fully releases the potential capacity of the existing equipment, improves the load condition of the distribution transformer, improves the capacity of the distribution network for the distributed new energy consumption and the novel direct current load access, and improves the transmission safety.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution, in particular to a flexible direct current interconnection self-adaptive power coordination control method for multiple areas.
Background
The intermittent performance and the fluctuation of the existing medium-low voltage alternating current distribution equipment in terms of updating difficulty and distributed photovoltaic output can be fully utilized, the advantages of strong power supply capacity and strong control capacity of a direct current power grid can be fully exerted, and the bearing capacity of the distribution network to a distributed power supply and a novel direct current load can be comprehensively improved through the distribution side alternating current-direct current hybrid networking. However, the classical multi-terminal flexible direct current power coordination control method mainly solves the problems of power transmission and distribution among a plurality of alternating current power grids after direct current interconnection; unlimited expansion connection of the ports of the AC side platform area and plug and play of the DC side port equipment cannot be realized, and the adaptability of the hybrid AC-DC power distribution network to large-scale distributed power grid connection and wide DC load access is low; based on the defects, the invention provides a multi-zone flexible direct current interconnection self-adaptive power coordination control method.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a multi-zone flexible direct current interconnection self-adaptive power coordination control method, which can improve the convenience and stability of the power distribution side alternating current-direct current hybrid networking, realize unlimited expansion connection of the alternating current side station zone ports, and realize plug and play of direct current side port equipment. The cluster effect of the distribution transformer is exerted, the energy mutual utilization of a plurality of transformer areas is realized, the potential capacity of the existing equipment is fully released, the time domain and region peak value of the power flow of the distribution network are reduced, the load condition of the distribution transformer is improved, and the capacity of the distribution network for absorbing distributed new energy and accessing novel direct current load is improved.
To achieve the above object, an embodiment according to a first aspect of the present invention provides a multi-zone flexible dc interconnect adaptive power coordination control method, including the steps of:
step one: monitoring the AC load real-time power P of each station area Li I.e. ac side load P Li ；
When the system is in AC side load P Li When the power transmission value P of the VSC converter of each station area at the rated voltage is automatically adjusted when the power transmission value P is changed cni According to rated capacity S of transformer in each area Ni The size of the system realizes the uniform distribution of the system alternating current load;
step two: when the system DC side total power P Z When in change, each district VSC converter monitors the DC voltage U dc Changing the situation and by the power distribution coefficient K set in advance i According to rated capacity S of transformer in each zone Ni The power variation on the direct current side is uniformly distributed.
Further, the specific steps of the VSC converter for power coordination control are as follows:
the first step: calculating the average load rate lambda of alternating current load of the system, wherein the expression isWherein P is Li Representing the real-time power of the alternating current load of the ith station area, S Ni Representing the rated capacity of the ith area, and n represents the number of system areas;
and a second step of: calculating the transmission power P of each district VSC converter at rated voltage cni The expression is P cni ＝λS Ni -P Li ；
And a third step of: the transmission power margin of the VSC converter is determined by combining the load of the transformer, the rated capacity and the manufacturing cost of the VSC converter, wherein the transmission power limiting formula is as follows:
wherein mu is a preset VSC converter power coefficient, and mu is more than 0 and less than or equal to 1; p (P) ci,max Representing the maximum transmission power of the i-th district VSC converter; p (P) ci,min Representing the minimum transmission power of the i-th district converter;
when the rated capacity of each transformer area is inconsistent, the self alternating current load rate is inconsistent, and the capacity of the VSC converter is smaller than the rated capacity of the transformer, the situation that the transmission power of a VSC converter reaches a limit value and the load rate of the transformer of the whole system is not completely consistent can occur, so that from the aspect of system control, the larger mu is better, but the mu can be set to a proper value by combining the load of the transformer, the rated capacity and the manufacturing cost of the converter;
fourth step: the maximum allowable variation range of the direct current voltage is determined, and the formula is as follows:
wherein alpha is a preset direct-current voltage fluctuation limiting coefficient, and 0 < alpha < 1; u (U) dcmax Represents the allowable maximum value of the direct current voltage, U dcmin Representing the allowable minimum value of the direct current voltage; u (U) dcN Representing a DC voltage rating;
comprehensively considering the stability of direct current voltage and the stability of self-adaptive power coordination control, proper parameters are required to be set for alpha, and the value is usually 0.05 to 0.20;
fifth step: determining the power distribution coefficient K of each district VSC converter i The formula is as follows:
sixth step: calculating the power command value P of each district VSC converter ci,ref The formula is as follows:
P ci，ref ＝λS Ni -P Li +K i (U dc -U dcN )
wherein U is dc Representing a DC voltage running value; from the formula, the DC side power of the system is shown as K i Distributed as a proportion, K i And is proportional to S Ni Therefore, the system DC power also varies according to each regionRated capacity S of press Ni The sizes are evenly distributed.
Further, when the load on the ac side is uneven, the load of the heavy-load transformer is transferred to the light-load transformer by the VSC converter.
Further, when the distributed power source, the energy storage or the direct current load power exists on the direct current side, the power distribution coefficient K of the VSC converter is distributed according to each station area i The direct current side load is uniformly distributed.
Compared with the prior art, the invention has the beneficial effects that:
the invention monitors the direct current voltage U in real time dc Calculating the average load rate lambda of the alternating current power of the system, and monitoring the alternating current load power P of each district VSC converter in real time Li Converter transmission power P ci The power command value P of the VSC converter of the local area can be obtained ci,ref Then, the integral control of the VSC converter is realized through classical double-loop control; the control of the alternating-current side VSC converter adopts a unified control strategy, and only the adaptive parameter adjustment is carried out according to the rated capacity of the transformer area, and no master-slave division exists, so that the alternating-current side VSC converter can be expanded without limitation, and the expansion connection of a system is facilitated; meanwhile, the invention equivalently regards the direct current side of all the areas as a constant power control port, the direct current side light, energy storage and direct current load can randomly adjust the power, the system direct current side can provide stable direct current voltage within a certain range for the system direct current side, and the direct current side equipment can realize plug and play; the grid connection and alternating current/direct current load access bearing capacity of the distribution network to the distributed power supply is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a multi-zone flexible direct current interconnection adaptive power coordination control method of the present invention.
Fig. 2 is a flow chart of the adaptive power coordination control of the VSC converter according to the present invention.
Fig. 3 is a schematic diagram of a "voltage-power" characteristic line of the adaptive power coordination control according to the present invention.
Fig. 4 is a classical dual loop control block diagram of adaptive power coordination control in the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 2, in the method for controlling flexible direct current interconnection self-adaptive power coordination of multiple areas, the capacity of transformers of each area is considered, and the VSC converters of all areas in an ac/dc hybrid power distribution system adopt a self-adaptive power coordination control strategy; the method comprises the following steps:
step one: monitoring the AC load real-time power P of each station area Li I.e. ac side load P Li The method comprises the steps of carrying out a first treatment on the surface of the When the system is in AC side load P Li When the power transmission value P of the VSC converter of each station area at the rated voltage is automatically adjusted when the power transmission value P is changed cni According to rated capacity S of transformer in each area Ni The size of the system realizes the uniform distribution of the system alternating current load;
in the embodiment, when the load on the alternating current side is uneven, the load of the heavy-load transformer is transferred to the light-load transformer through the VSC converter; when the power of a distributed power supply, energy storage or direct current load exists on the direct current side, uniformly distributing the direct current side load according to the power distribution coefficient of each district VSC converter;
step two: when the system DC side total power P Z When the power is changed, the balance of active power on the direct current side of the system is broken, and the direct current voltage is changed along with the break; each site VSCThe converter monitors the DC voltage U dc Changing the situation and by the power distribution coefficient K set in advance i According to rated capacity S of transformer in each zone Ni The power variation of the direct current side is uniformly distributed;
the specific steps of the adaptive power coordination control of the VSC converter are as follows:
the first step: calculating the average load rate lambda of alternating current load of the system, wherein the expression isWherein P is Li Representing the real-time power of the alternating current load of the ith station area, S Ni Representing the rated capacity of the ith area, and n represents the number of system areas;
and a second step of: calculating the transmission power P of each district VSC converter at rated voltage cni The expression is P cni ＝λS Ni -P Li ；
And a third step of: the transmission power margin of the VSC converter is determined by combining the load of the transformer, the rated capacity and the manufacturing cost of the VSC converter, wherein the transmission power limiting formula is as follows:
wherein μ (0<Mu is less than or equal to 1) is the power coefficient of the preset VSC converter, P ci,max Representing the maximum transmission power of the i-th district VSC converter; p (P) ci,min Representing the minimum transmission power of the i-th district converter;
in this embodiment, when the rated capacity of each transformer area is inconsistent, the ac load rate of each transformer area is inconsistent, and the VSC converter capacity is smaller than the rated capacity of the transformer, the transmission power of a VSC converter may reach a limit value, so that the transformer load rate of the whole system is not completely consistent, and therefore, from the perspective of system control, μ is larger and better, but μ can be set to a certain proper value in combination with the transformer load, the rated capacity and the converter cost;
fourth step: the stability of the direct current voltage and the stability of the self-adaptive power coordination control are comprehensively considered, and the maximum allowable change range of the direct current voltage is determined according to the following formula:
wherein alpha (0 < alpha < 1) is a direct-current voltage fluctuation limiting coefficient, U dcmax Represents the allowable maximum value of the direct current voltage, U dcmin Representing the allowable minimum value of the direct current voltage; u (U) dcN Representing a DC voltage rating;
comprehensively considering the stability of direct current voltage and the stability of self-adaptive power coordination control, proper parameters are required to be set for alpha, and the value is usually 0.05 to 0.20;
fifth step: determining the power distribution coefficient K of each district VSC converter i The formula is as follows:
sixth step: calculating the power command value P of each district VSC converter ci,ref The formula is as follows:
P ci，ref ＝λS Ni -P Li +K i (U dc -U dcN )
wherein U is dc Representing a DC voltage running value; from the formula, the DC side power of the system is shown as K i Distributed as a proportion, K i And is proportional to S Ni Therefore, the DC side power of the system is also according to the rated capacity S of the transformer in each zone Ni Uniformly distributing the sizes;
referring to fig. 3, when the transformer of the zone i is heavily loaded and the other transformers are lightly loaded, the transmission power P of the converter of the zone i may appear at the rated voltage thereof cni When the lower limit value is reached and the whole DC side presents the charging characteristic, the converter of the station area i can not bear the DC side power any more, and constant power control is adopted; when three are arrangedWhen the alternating current load of the transformer area is balanced, the transformer area i converter does not need to adjust the power to balance the load at the alternating current side, and the transformer area i converter can possibly generate the transmission power P under the rated voltage cni Is 0; when the transformer in the transformer area i is lightly loaded and other transformers are heavily loaded, the converter in the transformer area i is likely to generate transmission power P under the rated voltage cni When the upper limit value is reached and the overall discharge characteristic of the DC side is presented, the converter of the station area i can not bear the DC side any more, and constant power control is adopted. Typically, the "voltage-power" characteristic lines of the converters are in their transitional state, within which the characteristic lines float up;
referring to fig. 4, the invention monitors the direct current voltage U in real time dc Calculating the average load rate lambda of the alternating current power of the system, and detecting the alternating current load power P of the current converter station Li Converter transmission power P ci The power command value P of the VSC converter station of the current station area can be obtained ci,ref Then, the integral control of the VSC converter is realized through classical double-loop control;
the control of the alternating-current side VSC converter adopts a unified control strategy, and only the adaptive parameter adjustment is carried out according to the rated capacity of the transformer area, and no master-slave division exists, so that the alternating-current side VSC converter can be expanded without limitation, and the expansion connection of a system is facilitated; meanwhile, the invention equivalently regards the direct current side of all the areas as a constant power control port, the direct current side light, energy storage and direct current load can randomly adjust the power, the system direct current side can provide stable direct current voltage within a certain range for the system direct current side, and the direct current side equipment can realize plug and play; the grid connection and alternating current/direct current load access bearing capacity of the distribution network to the distributed power supply is greatly improved.
The above formulas are all formulas with dimensions removed and numerical values calculated, the formulas are formulas which are obtained by acquiring a large amount of data and performing software simulation to obtain the closest actual situation, and preset parameters and preset thresholds in the formulas are set by a person skilled in the art according to the actual situation or are obtained by simulating a large amount of data.
The working principle of the invention is as follows:
multi-zone flexible direct current interconnection self-adaptive power coordination control method, and during operation, alternating current and direct current are mixedThe VSC converters of all the areas in the power combining and distributing system adopt a self-adaptive power coordination control strategy; by monitoring the AC load real-time power P of each station Li I.e. ac side load P Li The method comprises the steps of carrying out a first treatment on the surface of the When the system is in AC side load P Li When the power transmission value P of the VSC converter of each station area at the rated voltage is automatically adjusted when the power transmission value P is changed cni According to rated capacity S of transformer in each area Ni The size of the system realizes the uniform distribution of the system alternating current load; when the overall power PZ of the system DC side changes, the balance of the active power of the system DC side is broken, and the DC voltage also changes; each district VSC converter monitors the DC voltage U dc Changing the situation and by the power distribution coefficient K set in advance i According to rated capacity S of transformer in each zone Ni The power variation of the direct current side is uniformly distributed; the grid connection and alternating current/direct current load access bearing capacity of the distribution network to the distributed power supply is greatly improved.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (3)
1. A multi-zone flexible direct current interconnection self-adaptive power coordination control method is characterized by comprising the following steps:
step one: monitoring the real-time power of the alternating current load of each station area, namely the alternating current side load;
when the alternating-current side load in the system changes, the VSC converter of each station automatically adjusts the power transmission value of the VSC converter under the rated voltage, and the uniform distribution of the alternating-current load of the system is realized according to the rated capacity of the transformer of each station;
step two: when the total power of the direct current side of the system changes, each transformer area VSC converter monitors the change condition of the direct current voltage and uniformly distributes the power change quantity of the direct current side according to the rated capacity of each transformer area through the power distribution coefficient which is set in advance;
the specific steps of the power coordination control of the VSC converter are as follows:
the first step: calculating the average load rate lambda of alternating current load of the system, wherein the expression isWherein P is Li Representing the real-time power of the alternating current load of the ith station area, S Ni Representing rated capacity of transformer in ith area, n represents number of system areas;
and a second step of: calculating the power transmission value P of each district VSC converter at rated voltage cni The expression is P cni ＝λ×S Ni -P Li ；
And a third step of: the transmission power margin of the VSC converter is determined by combining the load of the transformer, the rated capacity and the manufacturing cost of the VSC converter, wherein the transmission power limiting formula is as follows:
wherein mu is a preset VSC converter power coefficient, and mu is more than 0 and less than or equal to 1; p (P) ci,max Represents the most current of the i-th VSC converterHigh transmission power; p (P) ci,min Representing the minimum transmission power of the i-th zone converter;
fourth step: the maximum allowable variation range of the direct current voltage is determined, and the formula is as follows:
wherein alpha is a preset direct-current voltage fluctuation limiting coefficient, and 0 < alpha < 1; u (U) dcmax Represents the allowable maximum value of the direct current voltage, U dcmin Representing the allowable minimum value of the direct current voltage; u (U) dcN Representing a DC voltage rating;
fifth step: determining the power distribution coefficient K of each district VSC converter i The formula is as follows:
sixth step: calculating the power command value P of each district VSC converter ci,ref The formula is as follows:
P ci，ref ＝λS Ni -P Li +K i (U dc -U dcN )
wherein U is dc Representing the dc voltage running value.
2. The method for adaptive power coordinated control of a multi-zone flexible direct current interconnection of claim 1, wherein when the alternating current side load is not uniform, the load of the heavy-load transformer is transferred to the light-load transformer by the VSC converter.
3. The method for coordinated control of flexible direct current interconnection adaptive power in multiple zones according to claim 1, wherein when distributed power, stored energy or direct current load power exists on the direct current side, the power distribution coefficient K of the VSC converter in each zone is calculated according to the power distribution coefficient K of the VSC converter in each zone i The direct current side load is uniformly distributed.
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| CN105024394A (en) * | 2015-07-28 | 2015-11-04 | 南方电网科学研究院有限责任公司 | Active power distribution method and system of combined back-to-back direct current transmission system |
| WO2022016622A1 (en) * | 2020-07-22 | 2022-01-27 | 南京东博智慧能源研究院有限公司 | Adaptive optimization and control method in event of failure of true bipolar flexible direct-current power transmission system |
| CN114142515A (en) * | 2021-12-31 | 2022-03-04 | 江苏省电力试验研究院有限公司 | Distribution network flexible interconnection coordination control method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105024394A (en) * | 2015-07-28 | 2015-11-04 | 南方电网科学研究院有限责任公司 | Active power distribution method and system of combined back-to-back direct current transmission system |
| WO2022016622A1 (en) * | 2020-07-22 | 2022-01-27 | 南京东博智慧能源研究院有限公司 | Adaptive optimization and control method in event of failure of true bipolar flexible direct-current power transmission system |
| CN114142515A (en) * | 2021-12-31 | 2022-03-04 | 江苏省电力试验研究院有限公司 | Distribution network flexible interconnection coordination control method and device |
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